J112RL1G N-Channel JFET Equivalent & Substitute Parts

Part Overview

The J112RL1G is an N-Channel JFET transistor manufactured by onsemi, rated for 35 V breakdown voltage with 350 mW power dissipation in a TO-92 through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Active alternatives with identical or enhanced electrical characteristics are available from the same manufacturer.

Key Parameters

Parameter	Value	Unit
Voltage - Breakdown (V(BR)GSS)	35	V
Current - Drain (Idss) @ Vds (Vgs=0)	5	mA @ 15 V
Voltage - Cutoff (VGS off) @ Id	1	V @ 1 µA
Resistance - RDS(On)	50	Ohms
Power - Max	350	mW
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	TO-226-3, TO-92-3 Long Body	Through Hole
FET Type	N-Channel

Substitute Part Grouping Explanation

Substitution eligibility for the J112RL1G is determined by the following criteria:

Electrical Compatibility Requirements:

Voltage - Breakdown (V(BR)GSS): Must equal or exceed 35 V
Current - Drain (Idss) @ Vds (Vgs=0): Must equal 5 mA @ 15 V
Voltage - Cutoff (VGS off) @ Id: Must equal 1 V @ 1 µA
Resistance - RDS(On): Must equal 50 Ohms
FET Type: Must be N-Channel

Mechanical Compatibility Requirements:

Package / Case: Must be TO-226-3 or TO-92-3 compatible
Mounting Type: Must be Through Hole

Acceptable Variations:

Power - Max: May be equal to or greater than 350 mW
Operating Temperature Range: May be equal to or narrower than -65°C to 150°C
Product Status: Active parts are preferred for new designs; obsolete parts are acceptable for legacy applications

The following substitute parts meet all electrical and mechanical compatibility criteria:

J112-D26Z: Identical electrical parameters; enhanced power rating (625 mW); active product status
J112-D27Z: Identical electrical parameters; enhanced power rating (625 mW); active product status
J112-D74Z: Identical electrical parameters; enhanced power rating (625 mW); active product status
J111-D26Z: Different electrical parameters (Idss 20 mA, VGS off 3 V); not a direct substitute

Parameter Comparison

Parameter	J112RL1G (Main)	J112-D26Z	J112-D27Z	J112-D74Z	J111-D26Z
Voltage - Breakdown (V(BR)GSS)	35 V	35 V	35 V	35 V	35 V
Current - Drain (Idss) @ Vds (Vgs=0)	5 mA @ 15 V	5 mA @ 15 V	5 mA @ 15 V	5 mA @ 15 V	20 mA @ 15 V
Voltage - Cutoff (VGS off) @ Id	1 V @ 1 µA	1 V @ 1 µA	1 V @ 1 µA	1 V @ 1 µA	3 V @ 1 µA
Resistance - RDS(On)	50 Ohms	50 Ohms	50 Ohms	50 Ohms	30 Ohms
Power - Max	350 mW	625 mW	625 mW	625 mW	625 mW
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Package / Case	TO-226-3, TO-92-3 Long Body	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Recommended for New Designs):

J112-D26Z, J112-D27Z, and J112-D74Z are direct electrical equivalents to the J112RL1G. All three parts maintain identical drain current (Idss), cutoff voltage (VGS off), and on-resistance (RDS(On)) specifications. The enhanced power rating (625 mW versus 350 mW) provides additional thermal margin without affecting circuit operation. All three parts carry active product status and ROHS3 compliance, making them suitable for new production designs.

Not Recommended:

J111-D26Z differs in critical electrical parameters (Idss 20 mA, VGS off 3 V, RDS(On) 30 Ohms) and is not a direct substitute for the J112RL1G. This part operates in a different performance class and may alter circuit behavior.

Temperature Consideration:

The J112RL1G specifies an operating temperature range of -65°C to 150°C, while all active substitutes specify -55°C to 150°C. Applications requiring operation below -55°C must retain the original J112RL1G or source equivalent parts with extended low-temperature ratings.

Frequently Asked Questions (FAQ)

Q: Can J112-D26Z, J112-D27Z, and J112-D74Z be used interchangeably with J112RL1G?

A: Yes. These three parts are electrically and mechanically identical to the J112RL1G. All maintain the same drain current (5 mA), cutoff voltage (1 V), and on-resistance (50 Ohms). The higher power rating (625 mW) is a non-limiting enhancement. Pin configuration and TO-92 package dimensions are compatible.

Q: What is the difference between J112-D26Z, J112-D27Z, and J112-D74Z?

A: These three parts are electrically identical. The suffix designations (D26Z, D27Z, D74Z) indicate different manufacturing date codes or tape/reel packaging configurations. Selection among these three is based on inventory availability and packaging preference (Cut Tape).

Q: Why is J111-D26Z listed but not recommended?

A: J111-D26Z has different electrical characteristics. The drain current (Idss) is 20 mA instead of 5 mA, the cutoff voltage (VGS off) is 3 V instead of 1 V, and the on-resistance (RDS(On)) is 30 Ohms instead of 50 Ohms. These differences alter circuit gain and biasing behavior, making it unsuitable as a direct replacement.

Q: Are there temperature limitations when substituting with active parts?

A: Yes. The J112RL1G operates from -65°C to 150°C, while J112-D26Z, J112-D27Z, and J112-D74Z operate from -55°C to 150°C. Applications requiring operation below -55°C must use the original J112RL1G or source parts with equivalent extended low-temperature specifications.

Q: Is the higher power rating (625 mW) of substitute parts a concern?

A: No. A higher power rating is a non-limiting enhancement. The substitute parts can dissipate more heat than the original 350 mW specification without affecting electrical performance or circuit operation.

Q: Are the substitute parts RoHS compliant?

A: Yes. J112-D26Z, J112-D27Z, and J112-D74Z are ROHS3 compliant. The original J112RL1G RoHS status is not specified in the provided data.

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